Determination of the Room Temperature Intersystem Crossing Quantum Yield of Quinoline in Alcoholic Solvents

The room temperature intersystem crowing quantum yields,    of quinoline in three most commonly used alcoholic solute have been measured by the method of  photomemitized per oxidation of  1,3-diphenylisebenzofuran 'Die proposed  remain mechanism stipulates that triplet quinoline  molecules generated from their  excited singlet state transfer their excitation energy to oxygen molecular proceed   in the reaction solution The subsequently formed excited singlet state  molecular oxygen, O2 (la,)    will   then peroxides the 1,34iphenylisabenzofuransubstrate. Rate equations derived  on the  basis of this mechanism are used to plot experimental data and  calculate results.     values  of 0.24 ± 0.04, 0.18 ±  0.04 and   0.23 ±  0.04 have been obtained for methanol, ethanol and isopropanol, respectively.

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